How to convert map to url query string?

Question

Do you know of any utility class/library, that can convert Map into URL-friendly query string?

Example:

I have a map:

\"param1\"=12,
\"param2         


        

Answer 1

Using EntrySet and Streams:

map
  .entrySet()
  .stream()
  .map(e -> e.getKey() + "=" + e.getValue())
  .collect(Collectors.joining("&"));